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| Content Provider | Springer Nature Link |
|---|---|
| Author | Basnet, Kumar Bahadur, Min Mukhopadhyay, Ananda |
| Copyright Year | 2017 |
| Abstract | The heteropteran bug, Helopeltis theivora is a polyphagous pest attacking the foliage crop tea and several other crops grown in the old world tropics. Application of synthetic insecticides, especially organophosphate was so far an effective and economic means of conventional management of the pest. Severe selection (bottlenecking) of H. theivora population by exposure to LC$_{80}$ dose of an organophosphate insecticide, monocrotophos resulted in 105 fold increase in tolerance level in the third generation. The total activity of general esterases (GE) and cytochrome P450 mono-oxygenases (CYP450) analogously increased in insecticide-selected F2 generation by 16.4 and 9.5 fold, respectively. Such enhanced enzyme activity could be related to the higher tolerance levels of the selected bug. Electropherogram of GE and CYP450 of the insecticide-selected generations indicated a change in isozyme profile with their elevated expressions. Induced isozymes in insecticide selected generations were only partially inhibited, when blocked by the insecticide. These findings imply that different groups (zones) of isozymes of the detoxifying enzymes are involved in imparting higher tolerance in insecticide-selected generations. Isozyme profiles of defence enzymes can be used as indices for identifying tolerance level in the field population of H. theivora, enabling tea planters to carry out rapid monitoring of the tolerance status of the pest populations, thereby providing a ready clue to choose an effective insecticide for pest management. |
| Starting Page | 527 |
| Ending Page | 539 |
| Page Count | 13 |
| File Format | |
| ISSN | 03342123 |
| Journal | Phytoparasitica |
| Volume Number | 45 |
| Issue Number | 4 |
| e-ISSN | 18767184 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2017-08-07 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | cytochrome P450 detoxifying enzymes general esterases Helopeltis theivora insecticide selection tolerance level Plant Pathology Plant Sciences Ecology Agriculture Life Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Insect Science |
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